add header required when boost shared ptr debugging is in use

diff --git a/gtk2_ardour/hit.cc b/gtk2_ardour/hit.cc
index cb9e479f6a7c6bda78fecb6f44ec613c70fdd1ae..e3a227d3c4167faafe8577d9673bf3f949ffbd2e 100644 (file)
--- a/gtk2_ardour/hit.cc
+++ b/gtk2_ardour/hit.cc
@@ -17,6 +17,7 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include "evoral/Beats.hpp"
 #include "evoral/Note.hpp"
 
 #include "canvas/polygon.h"